Answer: 140 ohm.
- A 104 ohm
- B 120 ohm
- C 140 ohm
- D 160 ohm
Correct answer: C. 140 ohm
Explanation: R = R0(1 + alpha x T) = 100(1 + 0.004 x 100) = 100 x 1.4 = 140 ohm.
In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.
Concept context
Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.